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(No Model.) 6 Sheets-Sheet 1.

W. H. BIDDING.

MAGIC LANTERN.

No. 373,607. Patented Nov. 22, 1887.

WITNESSES 5) IS) Mme w ATTORNEYS.

ETERS, Phnlo-Lflhographur, Walhingicn. n. c,

(No Modem 6 Sheets-Sheet 2.

W. H. BIDDING.

MAGIC LANTERN.

No. 373,607. Patented Nov. 22, 188

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(No Model.) 6 Shets$heet 3.

W. H. BIDDING.

MAGIG LANTERN.

No. 373,607. Patented Nov. 22, 1887.

WITNESSES 2 INVENTOR ZQJQW BY A YVW T LD m k E ATTORNE N. PETERS. Phmn-Lilhugnphcr. Wnhington, a. c,

(No Model.) 6 Sheets-Sheet 4.

W. H. BIDDING.

MAGIC LANTERN. v No. 373,607. Patented Nov. 22, 1887.

WITNESSES INVENTOR M Z9. s MM BY ATTORNEYS.

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(No Model.) 6 Sheets-Sheet 5..

' W. H. BIDDING.

MAGIC LANTERNP No. 373,607. Patented Nov. 22, 1887.

WITNESSES: INVBNTOR:

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ATTORNEYS.

UNITED STATES ATENT OFFICE.

WILLIAM H. BIDDING, OF BROOKLYN, ASSIGNOR TO THOMAS H. MOALLIS- TER, OF NEW YORK, N. Y.

MAGIC LANTERN.

SPECIFICATION forming part of Letters Patent. No. 373,607, dated November 22, 1887.

(No model.)

To aZZ whom it may concern.-

Be it known that 1, WILLIAM H. BIDDING, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Magic La-ntern, of which the following is a specification, reference being bad to the annexed drawings, forming a part thereof, in which- Figure 1 is a side elevation of my improved lantern, together with its adjustable support. Fig. 2 is a side elevation, partly in section. Fig. 3 is a detail perspective view of the condenser-cap and the burner-case. Fig. 4c is a side elevation of my improvement as applied to oil-lanterns. Fig. 5 is apartial side elevation showing the lamp-chimney and its con nections in vertical section. Fig. 6 is a plan view of the base of the lamp-chimney. Fig. 7 shows a telescopic chimney with a removable cowl. Fig. 8 is a plan view of the burner and its support, and Fig. 9 is a rear elevation of the same.

Similar letters of reference indicate corresponding parts in all the figures.

The object of my invention is to improve the construction of the magic lantern, so as to render it capable of being packed in a very small space; also, to provide a construction which will admit of reducing the size of the light-chamber, and, further, to provide means for adjusting the lanterns where they are used in pairs, so as to cause their images to register on the screen.

My invention consists in an extensible frame provided with a condenser-holder and slide-holder, and having an objective holder connected with the slide-holder by a bellows, to permit of contracting the frame of the lantern into a small space.

It also consists in the combination, with the condenser-holder, of a centrally-apertured cap adapted to fit over the condenser-holder and to receive the casing inelosing the source of light.

It also further consists in an interchangeable slide-holder to adapt the lantern for producing photographic enlargements and to the use of lantern-slides.

My improved lantern is adapted for use in connection with any suitable source of light.

In the present case I have shown it as applied to the oxyhydrogen light and the oil-lamp.

I will first describe my improvement as applied to a double lantern or stereopticon, and afterward to a single lantern.

The rear frame, A, of the lower lantern is provided with legs a and has a circular aperture for receiving the condenser-holder B. It is also provided with a transverse opening, 0, for receiving ordinary slide-carriers or slides provided with thick mountings. In the legs a are secured tubes D, which extend rearwardly for receiving the sleeves c of the oxyhydrogen burner E, and extend forward a short distance beyond the opening 0, and are provided with clamping-screws d.

The front frame, F, of the lower lantern is provided with a threaded front plate for receiving the objective G, and is furnished with legs 0, to which are secured rods f, which extend regularly into the tubes D. The rear frame, A, and front frame, F, are connected by a bellows, II, which prevents the escape of light, at the same time permitting of the free extension or contraction of the lantern.

The condenserholder B is provided with a bead, g, for receiving the conical cap I, which fits over the condenser-holder and serves to prevent the escape of light between the burner and the condenser, the cap being provided with a projection, h, extending inwardly and adapted to engage the bead. The conical cap I is made in two diameters, and its rear end is provided with a circular aperture, i, to allow the light to pass from the source of light to and through the condenser. To the rear face of the cap are secured small channel-bars j, with their channels extending outwardly in opposite directions. To the channel-bars are fitted the inwardly-bent edges of the cornerpieces of the front frame, is, of the burnercasing-J. The burner-casing J has a top, Z, permanently fixed to the frame and provided with a deflector, 7a, which prevents the escape of light, but permits of the escape of heated air and the products of combustion. To the side of the frame k are hinged the side pieces, L L, of the casing J, the said side pieces consisting of two plates of sheet metal bent inwardly toward each other at their rear screens 0 0, which still further a sist in confining the light in the casing J.

To the sleeves c, fitted to the tubes D, is secured a cross-bar, M, in which is inserted a and, N, which extends vertically and is designed to receive the sleeve 10 of the ordinary oxyhydrogen-burner, E, the said burner being adjustable up and down and laterally upo the rod in the usual way.

As the upper lantern of the stereopticon is in all respects like the lower one, with the exception of the pivotal connection of the legs a with the ears q, projecting from the rear frame, A, of thelower lantern, and of the omission of the legs 6 from the front frame, F, it will be unnecessary to describe the upper lantern in detail.

To the front frame, F, of the upper lantern are pivotally secured bars 0, provided with slots 1', the said bars extending downward from opposite sides of the frame F and embracing the milled screws 8, by which the bars are clamped against the sides of the frame F of the lower lantern. By means of this construction the upper lantern may be tilted on the pivotal connection between its legs a and the ears g of the lower lantern, and it may be clamped at any desired elevation by means of the milled screws 5.

The box P, which is designed for the double purpose of containing the instrument when notin use and as an adjustable'support for the instrument while in use, is provided with a hingedlid, t, between which and the upper edges of the box is placed a bar, u, which is moved toward the hinges of the lid when it is desired to increase the elevation of the lantern and is moved in the opposite direction when it is desired to depress the lantern, the lantern being secured to the top of the box by screws to prevent it from moving on its support. When it is desired to depress the lantern more than is possible when it is ar ranged in the position shown in Fig. 1, the lantern is reversed on the lid t.

When my improvement is applied to alantern employing oil as an illuminant, a lam-pholder, Q, consisting ofa rectangular box, is secured between rearwardly-projecting ends of the tubes D, and to this holderis fitted the lamp-reservoir R, provided with wick-tubes v, surmounted by the cone to and chimneysupport as. The condenser-holder B is provided with a conical cap, I, (as in the case before described,)- and the rear of the cap is furnished with channel-bars c for receiving the front S of the lamp-chimney T. The top of the rear frame, A, is provided with lateral flanges 01 d to which is fitted aplate, e, having its edges bent over or returned upon themselves, forming channels for receiving the said flanges, and to the plate e is secured one end flange d, the said flange being provided with two downwardly projecting bowed springs, f which serve to press the photographic negative or positive against the side of the frame adjoining the condenser.

The chimney U (which is shown in Fig. 7) is oblong in section and is formed of two sec tions, h h one being adapted to slide into the other. To the outer end of the inner section is fitted'a removable cowl,V, formed of an oval plate provided on diametrically-opposite edges with three cars, t" z" '5, the ears i being adapted to enter into the end of the chimney, while the ears i reach a short distance over the outside of the chimney. The elasticity of the ears causes them to clamp the walls of the chimney with sufficient pressure to hold the cowl in theposition of use.

Having thus fullydescribed my invention, I claim as new and desire to secure by Letters Patent 1. In a magic lantern, the combination of two similar lantern-frames connected together pivotally one above the other and a clamp arranged to hold the upper lantern-frame at.

any angle of inclination, substantially as specified.

2. In amagiclantern, alantern-frame formed of a rear part arranged to hold the condenser in the position of use and to hold and guide the lantern-slide, and a front part arranged to hold the lantern objective, an adjustable telescopic connection between the front and rear frame, and a bellows attached to the front and rear frames and forming an adjustable light-tight chamber, substantially as specified.

3. In a magic lantern, the combinatiomwith the cylindrical condenser-casing, of a conical centrally-apertured'cap adapted to fit over the condenser-casing, anda casing adapted to contain the source of light and adjustably connected with the said conical cap, substantially as specified.

4. A casing for containing the source of light of a magic lantern, the same consisting of the frame k, provided with the apertured topl and the apertured angled side plates, L L, hinged to the frame and provided with the screens a n o o, substantially asspecified.

5. In a magic lantern, the combination of two rear lantern-frames, A, provided with the tubes D and connected together pivotally by the screws q, two front frames, F, provided with a rod entering the tubes D, the slotted bars 0, pivoted to the upper frames F, and condenser-case B, provided with the bead g,

the clamping screws 8, entering the lower extending around its periphery, of the conical frames F and adapted to clamp the slotted centrally-apertured light-confining cap I, pro- 1 bars 0, substantially as specified. vided with an internal projection, h, for en- 5 6. The combination, with the condensergaging the said bead g and retaining the cap case B, provided with the head of the conion the condensercase, substantially as specioal centrally-apertured cap I, provided with fied.

the projection h, adapted to engage the said bead g, the said cap I being interposed be- WILLIAM BIDDING IO tween the burner and condenser to prevent Witnesses:

the escape of light, substantially as specified. EDWD. M. CLARK,

7. The combination, with the cylindrical EDGAR TATE. 

